Even with infinitely powerful telescopes,we can look back in time only until
A) when galaxies were first formed.
B) when hydrogen and helium were formed.
C) when gravity was quantum mechanical.
D) the time of recombination.

Question

Quizplus · Accepted Answer

The time of recombination marks the moment when the universe had cooled enough for hydrogen to become neutral atoms, allowing radiation to travel freely through space. This radiation is what we detect as the cosmic microwave background radiation, which gives us the oldest observable light in the universe. Therefore, with infinitely powerful telescopes, we could look back in time only until the time of recombination.

Even with Infinitely Powerful Telescopes,we Can Look Back in Time